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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 by Martin Pool <mbp@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/*
* And the magicians did so with their enchantments,
* and brought up frogs upon the land of Egypt.
* -- Exodus 8:7
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "distcc.h"
#include "util.h"
#include "trace.h"
#include "exitcode.h"
/**
* For masquerade mode, change the path to remove the directory containing the
* distcc mask, so that invoking the same name will find the underlying
* compiler instead.
*
* @param progname basename under which distcc was introduced. If we reached
* this point, then it's the same as the name of the real compiler, e.g. "cc".
*
* @param did_masquerade specifies an integer that will be set to 1 if the
* path was changed.
*
* @return 0 or standard error.
**/
int dcc_support_masquerade(char *argv[], char *progname, int *did_masquerade)
{
const char *envpath, *findpath, *p, *n;
char *buf;
size_t len;
size_t findlen;
if (!(envpath = getenv("PATH")))
/* strange but true*/
return 0;
if (!(buf = malloc(strlen(envpath)+1+strlen(progname)+1))) {
rs_log_error("failed to allocate buffer for new PATH");
return EXIT_OUT_OF_MEMORY;
}
/* Filter PATH to contain only the part that is past our dir.
* If we were called explicitly, find the named dir on the PATH. */
if (progname != argv[0]) {
findpath = dcc_abspath(argv[0], progname - argv[0] - 1);
findlen = strlen(findpath);
} else {
findpath = NULL;
findlen = 0;
}
for (n = p = envpath; *n; p = n) {
/* Find the length of this component of the path */
n = strchr(p, ':');
if (n)
len = n++ - p;
else {
len = strlen(p);
n = p + len;
}
if (findpath) {
/* Looking for a component in the path equal to findpath */
/* FIXME: This won't catch paths that are in fact the same, but
* that are not the same string. This might happen if you have
* multiple slashes, or dots, or symlinks... */
if (len != findlen || strncmp(p, findpath, findlen) != 0)
continue;
} else {
/* Looking for a component in the path containing a file
* progname. */
/* FIXME: This gets a false match if you have a subdirectory that
* happens to be of the right name, e.g. /usr/bin/distcc... */
strncpy(buf, p, (size_t) len);
sprintf(buf + len, "/%s", progname);
if (access(buf, X_OK) != 0)
continue;
}
/* Set p to the part of the path past our match. */
p = n;
break;
}
if (*p != '\0') {
int ret = dcc_set_path(p);
if (ret)
return ret;
*did_masquerade = 1;
}
else {
rs_trace("not modifying PATH");
*did_masquerade = 0;
}
free(buf);
return 0;
}
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